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Conference ssag::ask_ssag

Title:Ask the Storage Architecture Group
Notice:Check out our web page at http://www-starch.shr.dec.com
Moderator:SSAG::TERZAN
Created:Wed Oct 15 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6756
Total number of notes:25276

6377.0. "16 device support on FW SCSI controllers ?" by XFMV01::AJITK () Thu Feb 06 1997 07:05

Hi 

Do any of our fast and wide controllers support 
16 SCSI devices ?

Thanks in advance.

Ajit
T.RTitleUserPersonal
Name
DateLines
6377.1netrix.lkg.dec.com::thomasThe Code WarriorThu Feb 06 1997 07:225
No (assuming you are referring to single LUN devices).

Since the adapter itself takes a SCSI number, the maximum is 15.
However some platforms don't support more than 8 (current versions
of Digital UNIX for instance).
6377.2CSC32::D_STUARTfirefighting,wetstuffvsredstuffThu Feb 06 1997 10:152
    NT does support 16 scsi ID's I have heard
    none of the other OS do....yet
6377.3LEFTY::CWILLIAMSCD or not CD, that's the questionThu Feb 06 1997 11:537
    While NT supports 16 ID's with a wide controller, that translates to a
    15 device max, with 1 ID reserved for the controller.
    
    No one can support 16 devices with 1 ID per device.
    
    Chris
    
6377.4If OpenVMS, You'll Need V7.1XDELTA::HOFFMANSteve, OpenVMS EngineeringThu Feb 06 1997 13:135
    You'll need OpenVMS V7.1 or later if you want to use the `upper' eight
    units available in wide SCSI.  Be aware that you might also end up
    saturating the bus or the controller with that many (fast) disks...

6377.5summaryXFMV01::AJITKThu Feb 06 1997 22:1315
Hi

To summarise :

OS		16 SCSI device support 
		(incl 1 SCSI Id for controller) 
----		-------------------------------

Unix		No (when ???)
OpenVMS		7.1 onwards
WNT		Yes (3.51 onwards ????)

Is this correct ?

Ajit
6377.6KITCHE::schottEric R. Schott USG Product ManagementSat Feb 08 1997 07:293
For UNIX, it is the steel release.  Vince Mamone is the
product manager.